EP1215641B1 - Apparatus for monitoring and controlling a traffic control light - Google Patents

Apparatus for monitoring and controlling a traffic control light Download PDF

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Publication number
EP1215641B1
EP1215641B1 EP01204845A EP01204845A EP1215641B1 EP 1215641 B1 EP1215641 B1 EP 1215641B1 EP 01204845 A EP01204845 A EP 01204845A EP 01204845 A EP01204845 A EP 01204845A EP 1215641 B1 EP1215641 B1 EP 1215641B1
Authority
EP
European Patent Office
Prior art keywords
light
leds
control
detectors
control light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01204845A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1215641A2 (en
EP1215641A3 (en
Inventor
Kari Taskula
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sabik Oy
Original Assignee
Sabik Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sabik Oy filed Critical Sabik Oy
Publication of EP1215641A2 publication Critical patent/EP1215641A2/en
Publication of EP1215641A3 publication Critical patent/EP1215641A3/en
Application granted granted Critical
Publication of EP1215641B1 publication Critical patent/EP1215641B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1881—Wiring diagrams for power supply, control or testing
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/095—Traffic lights
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/097—Supervising of traffic control systems, e.g. by giving an alarm if two crossing streets have green light simultaneously
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L2207/00—Features of light signals
    • B61L2207/02—Features of light signals using light-emitting diodes [LEDs]

Definitions

  • the present invention relates to an apparatus for controlling and monitoring control lights used in traffic control, such as traffic lights, railway semaphores or waterway lights, the light source of said lights consisting of LEDs connected to a circuit board, said lights being controlled by means of a control unit and provided with light directing elements fitted in front of the LEDs.
  • Incandescent lamps involve the problems of a high power consumption, a short service life and consequent high maintenance costs.
  • Patent specification FI 970672 presents a control light designed for land and water traffic and implemented using light-emitting diodes (LED) as a light source.
  • LED light-emitting diodes
  • a Fresnel lens is fitted in the lens dome opposite to each LED to direct the light emitted by the diode.
  • the Fresnel lens comprises a central lens part and lens ring parts disposed around it.
  • the lens dome part has a smooth outer surface, and the Fresnel lenses are fitted inside the lens dome part.
  • Control lights are currently monitored by monitoring the electric power supplied to the lights. In the case of malfunction, the supply of power to the control light is interrupted by means of a signal box and e.g. in the event of a short circuit by means of fuses. However, when LED technology is applied, measuring the current is an insufficient and relatively inaccurate method of monitoring the control lights and does not provide information about their actual working condition in all situations.
  • EP 974 947 presents a traffic light system based on optical feedback and comprising a light source consisting of a matrix of light-emitting diodes, and a monitoring apparatus for monitoring the light-emitting diodes.
  • the monitoring apparatus comprises a detector monitoring the light of the LEDs, and a comparison unit connected to it. Placed in front of the LEDs is a transparent plate. The light detector is placed in the same plane with the LEDs and, like the LEDs, directed toward the dome part, so that the light detector receives part of the light reflected from the transparent dome.
  • the object of the present invention is to eliminate the disadvantages of prior-art solutions and to achieve an apparatus that produces information about the actual working condition of a control light.
  • the monitoring apparatus of the invention utilizes optical feedback which makes it possible to monitor and regulate the operation of LEDs used as a light source.
  • the invention uses separate non-transparent reflectors placed between the transparent light directing elements of the lens dome part.
  • the reflectors prevent light and/or other radiation, e.g. UV and/or IR radiation, emitted from outside the control light from being admitted to the detector, which means that illumination and/or other radiation conditions outside the control light will not interfere with the operation of the apparatus for monitoring and controlling the control light.
  • the optical feedback can be utilized in the regulation of the luminous intensity of the light source.
  • the figure presents a control light as used e.g. in a railway semaphore, implemented using LEDs as a light source.
  • the control light produces a unidirectional light beam which is directed from a long distance at the locomotive of an approaching train so that the locomotive driver can observe the light of the semaphore in good time and act according to the color of the light.
  • the control light comprises a frame which is provided e.g. with an edge flange by means of which it can be connected to a semaphore in place of incandescent lamps.
  • the frame can accommodate a transformer and other equipment needed for controlling the control light, as well as a circuit board 1.
  • the control electronics is fitted on the circuit board 1 or on a separate circuit board.
  • LEDs 2 Connected on the surface of the circuit board 1 are LEDs 2. These are typically disposed in straight rows in both vertical and horizontal directions. The number of rows is typically more than 10.
  • a transparent lens dome part 3 made of plastic, e.g. polycarbonate, which may be colorless or colored and has a smooth and planar outer surface which thus forms the outer surface of the control light and is easy to keep clean.
  • a lens element Placed opposite to each LED inside the lens dome part is a lens element, which in this figure is a Fresnel lens 4.
  • optical feedback which is used to monitor the operation of the LEDs, by directing some of the light of the LED 2 via optical feedback to the control electronics, where the detection and adjustment of the luminous intensity of the light source, the level measurement and fault detection in case of malfunctions and disturbances can be performed.
  • the circuit board 1 is provided with detectors, such as photosensitive transistors 5, placed between the LEDs on the same side of the circuit board 1, for detecting the light emitted by the LEDs.
  • detectors such as photosensitive transistors 5
  • the signals produced by the detectors are input to the control electronics.
  • Some of the light received from the LEDs 2 is passed to the photosensitive transistors 5 via non-transparent reflectors 6 attached between the lenses 4.
  • the reflectors 6 consist of an arm 61 serving to connect them to the inner surface 7 of the lens dome between the lenses 4 and of a reflector element, which has for each of the four LEDs 2 placed beside the reflector 6 a concave reflector surface 62 which deflects some of the light received from the LED 2 to the photosensitive transistor 5.
  • the reflector surfaces 62 are typically silver-plated, and they may partially overlap the Fresnel lenses 4 so that light emitted toward the reflector at an angle equal to or larger than angle A relative to the center axis 8 of the LED 2 will proceed to the reflector 6 and further to the transistor 5.
  • the angle A may be e.g. about 20°.
  • the reflector 6 mounted in front of the photosensitive transistor 5 prevents light coming from outside the control light from being admitted to the photosensitive transistor 5, which means that illumination conditions outside the control light will not have a disturbing effect on the operation of the apparatus monitoring and controlling the control light.
  • the reflector protects the detectors from other undesirable radiation (e.g. UV and IR radiation) received from outside the control light.
  • control light may be provided with a required number of reflectors and transistors so that a reliable representation of the operation of the control light is obtained.
  • the length and shape of the arm of the reflector may be adapted so that the monitoring apparatus can be used for different types of LEDs and lenses.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Traffic Control Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Device Packages (AREA)
EP01204845A 2000-12-13 2001-12-13 Apparatus for monitoring and controlling a traffic control light Expired - Lifetime EP1215641B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20002733 2000-12-13
FI20002733A FI115250B (fi) 2000-12-13 2000-12-13 Liikenteen ohjausvalaisimen valvonta- ja säätölaitteisto

Publications (3)

Publication Number Publication Date
EP1215641A2 EP1215641A2 (en) 2002-06-19
EP1215641A3 EP1215641A3 (en) 2004-12-15
EP1215641B1 true EP1215641B1 (en) 2006-03-08

Family

ID=8559703

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01204845A Expired - Lifetime EP1215641B1 (en) 2000-12-13 2001-12-13 Apparatus for monitoring and controlling a traffic control light

Country Status (4)

Country Link
EP (1) EP1215641B1 (fi)
AT (1) ATE320056T1 (fi)
DE (1) DE60117683T2 (fi)
FI (1) FI115250B (fi)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2004272940A1 (en) * 2003-09-16 2005-03-24 Vega Industries Limited Improvements in and relating to sectored lights
FI117178B (fi) * 2004-12-23 2006-07-14 Sabik Ab Oy LED-valaisin liikenteen ohjaamiseksi
DE102005016363A1 (de) * 2005-04-09 2006-10-12 Aqua Signal Aktiengesellschaft Leuchte mit LED und Verfahren zum Betrieb der Leuchte
US7391162B2 (en) 2005-04-12 2008-06-24 Aqua Signal Aktiengesellschaft Luminaire with LED(s) and method for operating the luminaire
GB2446410B (en) * 2007-02-07 2011-07-13 Signal House Ltd Traffic signal light
IT1396088B1 (it) 2009-10-16 2012-11-09 Solari Di Udine S P A Dispositivo di segnalazione luminosa a led e relativo procedimento di controllo
DE102010005088A1 (de) * 2010-01-15 2011-07-21 Siemens Aktiengesellschaft, 80333 Lichtsignal
CN107690218B (zh) * 2017-08-31 2019-06-04 青岛海信网络科技股份有限公司 一种信号灯工作状态检测系统及方法
DE102018212585A1 (de) * 2018-07-27 2020-01-30 Siemens Aktiengesellschaft Lichtsignalanlage mit Schutz vor einem Mastangriff

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182977A (en) * 1978-06-01 1980-01-08 Trw Inc. Constant output light emitting device
GB9708861D0 (en) * 1997-04-30 1997-06-25 Signal House Limited Traffic signals
ATE285103T1 (de) * 1998-07-23 2005-01-15 Siemens Ag Lichtsignalanlage sowie verfahren zum überwachen der lichtsignalanlage

Also Published As

Publication number Publication date
DE60117683D1 (de) 2006-05-04
EP1215641A2 (en) 2002-06-19
FI20002733A0 (fi) 2000-12-13
ATE320056T1 (de) 2006-03-15
FI20002733A (fi) 2002-06-14
DE60117683T2 (de) 2006-11-30
EP1215641A3 (en) 2004-12-15
FI115250B (fi) 2005-03-31

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